Sneak into the Master's Glaive using the Panther Figurine and spy on the Twilight's Hammer leaders on the platform above.
The cultists appear to be digging out the remains of a being known as Soggoth the Slitherer.
Perhaps their superiors on the rafters above have more information.
You will also receive:
- 1,100 experience
- 6 60 (if completed at level 90)